Custom Species Lists

Invasive species (those which are not native to the region and are known to cause harm) and non-native species both threaten the integrity of the Puget Sound ecosystem. Non-native species have the potential to become invasive, and preventing their introduction to the Sound is better than the costly and difficult work of removing them once they become established. Invasive species utilize resources which are vital to the survival of native species, and may outcompete or even feed on indigenous plants and animals, driving them towards extinction. Invasive species also may introduce disease and parasites, alter habitat, and breed with native species, diluting their genetic material. The Puget Sound Partnership states that aquatic nuisance species are the second greatest threat to Puget Sound biodiversity, after habitat loss.

These lists of invasive and nonnative species come from multiple sources (listed below), and are as current as possible. However, the status of these species in the Puget Sound region is subject to change, and many efforts are underway to eradicate harmful populations.